XCache 是一个又快又稳定的 PHP opcode 缓存器. 经过良好的测试并在大流量/高负载的生产机器上稳定运行. 经过(在 linux 上)测试并支持所有现行 PHP 分支的最新发布版本, 如 PHP_5_1 PHP_5_2 PHP_5_3 PHP_5_4. 并完美支持线程安全/Windows. 与同类 opcode 缓存器相比更胜一筹, 比如能够快速跟进 PHP 版本.
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我的php为5.6.6版本，所以需要安装xcache3.2.0
官网下载：http://xcache.lighttpd.net/
tar zxvf xcache-3.2.0.tar.gz
cd xcache-3.2.0
/usr/local/php/bin/phpize
./configure --enable-xcache --with-php-config=/usr/local/php/bin/php-config
# make install
Installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-non-zts-20131226/
安装完成后会在上面的路径下生成xcache.so 文件；
php.ini文件加入xcache代码段（原文件为/usr/local/src/xcache-3.2.0/xcache.ini）
# vi /usr/local/php/etc/php.ini
[xcache-common]
extension = xcache.so
[xcache.admin]
xcache.admin.enable_auth = On
xcache.admin.user = "xcache"
xcache.admin.pass = ""
[xcache]
xcache.shm_scheme ="mmap"
xcache.size=60M
xcache.count =1
xcache.slots =8K
xcache.ttl=0
xcache.gc_interval =0
xcache.var_size=4M
xcache.var_count =1
xcache.var_slots =8K
xcache.var_ttl=0
xcache.var_maxttl=0
xcache.var_gc_interval =300
xcache.test =Off
xcache.readonly_protection = On
xcache.mmap_path ="/tmp/xcache"
xcache.coredump_directory =""
xcache.cacher =On
xcache.stat=On
xcache.optimizer =Off
[xcache.coverager]
xcache.coverager =On
xcache.coveragedump_directory =""
保存退出后，重启apache，php -v 查看是否有xcache信息；
# /usr/local/php/bin/php -v
PHP 5.6.6 (cli) (built: Jun 29 2015 17:23:08)
Copyright (c) 1997-2015 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies
with XCache v3.2.0, Copyright (c) 2005-2014, by mOo
with XCache Cacher v3.2.0, Copyright (c) 2005-2014, by mOo
或phpinfo.php 浏览器中查看；
xcache状态查询：
创建一个缓存文件：touch /tmp/xcache
拷贝xcache3.2.0目录下htdocs目录到你自己的网站目录下，自定义目录名为xcache；
# cp -r htdocs/ /data/www/blog/xcache/
生成md5密码，复制密码拷贝到刚才php.ini文件xcache.admin.pass="" 引号中。
# echo -n '123456' |md5sum
e10adc3949ba59abbe56e057f20f883e
在浏览器访问 www.star.com/xcache/，弹出认证框输入用户名和密码访问；
ab压力测试进行对比：未安装xcache与安装xcache
使用DELL R420真机(使用discuz论坛首页测试)
在另一台机器上，使用ab压力测试；未安装xcache，3000次并发为118； 3万次并发为74-94之间；
[root@localhost ~]# ab -n 3000 -c 100 www.yong.com/forum.php
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Server Software: Apache
Server Hostname: www.yong.com
Server Port: 80
Document Path: /forum.php
Document Length: 13222 bytes
Concurrency Level: 100
Time taken for tests: 25.247 seconds
Complete requests: 3000
Failed requests: 0
Write errors: 0
Total transferred: 42018000 bytes
HTML transferred: 39666000 bytes
Requests per second: 118.82 [#/sec] (mean) #每秒处理的请求数
Time per request: 841.579 [ms] (mean)
Time per request: 8.416 [ms] (mean, across all concurrent requests)
Transfer rate: 1625.25 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 1 4 9.0 2 85
Processing: 66 827 441.1 967 2003
Waiting: 55 812 437.8 953 1992
Total: 68 831 442.2 970 2031
Percentage of the requests served within a certain time (ms)
50% 970
66% 1085
75% 1147
80% 1187
90% 1295
95% 1411
98% 1680
99% 1791
100% 2031 (longest request)
可以查看日志记录也是3000条
[root@localhost logs]# cat yong.com-access_log_20150820.log|wc -l
3000
请求为3万次，测试结果如下：
[root@localhost ~]# ab -n 30000 -c 100 www.yong.com/forum.php
Server Software: Apache
Server Hostname: www.yong.com
Server Port: 80
Document Path: /forum.php
Document Length: 13222 bytes
Concurrency Level: 100
Time taken for tests: 402.065 seconds
Complete requests: 30000
Failed requests: 2
(Connect: 0, Receive: 0, Length: 2, Exceptions: 0)
Write errors: 0
Total transferred: 420614188 bytes
HTML transferred: 397069884 bytes
Requests per second: 74.61 [#/sec] (mean)
Time per request: 1340.216 [ms] (mean)
Time per request: 13.402 [ms] (mean, across all concurrent requests)
Transfer rate: 1021.62 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 1 170 639.2 4 7553
Processing: 60 1161 1108.3 1037 9234
Waiting: 54 911 534.1 975 7633
Total: 63 1331 1406.5 1068 12650
Percentage of the requests served within a certain time (ms)
50% 1068
66% 1208
75% 1323
80% 1482
90% 2672
95% 4181
98% 6083
99% 7630
100% 12650 (longest request)
系统负载，高达到88
开启xcache缓存后，3000次请求并发为368；3万次请求并发为103；系统负载高只有2-4；
[root@localhost ~]# ab -n 3000 -c 100 http://www.yong.com/forum.php
Server Software: Apache
Server Hostname: www.yong.com
Server Port: 80
Document Path: /forum.php
Document Length: 12579 bytes
Concurrency Level: 100
Time taken for tests: 8.132 seconds
Complete requests: 3000
Failed requests: 8
(Connect: 0, Receive: 0, Length: 8, Exceptions: 0)
Total transferred: 39787499 bytes
HTML transferred: 37732203 bytes
Requests per second: 368.90 [#/sec] (mean)
Time per request: 271.079 [ms] (mean)
Time per request: 2.711 [ms] (mean, across all concurrent requests)
Transfer rate: 4777.81 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 1 36 29.8 27 141
Processing: 27 230 112.0 222 919
Waiting: 17 196 104.1 178 864
Total: 31 266 107.4 252 951
Percentage of the requests served within a certain time (ms)
50% 252
66% 298
75% 333
80% 352
90% 398
95% 452
98% 518
99% 592
100% 951 (longest request)
请求为3万次，测试结果如下：
[root@localhost ~]# ab -n 30000 -c 100 http://www.yong.com/forum.php
Server Software: Apache
Server Hostname: www.yong.com
Server Port: 80
Document Path: /forum.php
Document Length: 13233 bytes
Concurrency Level: 100
Time taken for tests: 290.761 seconds
Complete requests: 30000
Failed requests: 29963
(Connect: 0, Receive: 0, Length: 29963, Exceptions: 0)
Total transferred: 397977862 bytes
HTML transferred: 377424199 bytes
Requests per second: 103.18 [#/sec] (mean)
Time per request: 969.202 [ms] (mean)
Time per request: 9.692 [ms] (mean, across all concurrent requests)
Transfer rate: 1336.67 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 1 273 830.2 7 5700
Processing: 18 693 1404.2 249 7851
Waiting: 14 366 547.2 212 5480
Total: 19 967 2080.8 276 12416
Percentage of the requests served within a certain time (ms)
50% 276
66% 382
75% 480
80% 567
90% 2453
95% 6768
98% 9107
99% 9879
100% 12416 (longest request)
每次ab压力测试的结果都不太准确，在虚拟机测试结果更不靠谱。特意找的真机测试，除了负载较高，内存使用竟然没太大变化；只能做参考用；
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分享标题：安装Xcache缓存加速php及ab压力测试结果-创新互联
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